Photon scattering from 16O above the giant dipole resonance
Mellendorf, Kenneth Ernest
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https://hdl.handle.net/2142/18877
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Title
Photon scattering from 16O above the giant dipole resonance
The elastic photon scattering differential cross section of 160 was measured
at 45° and 135° using tagged photons with energies between 27 MeV and 64 MeV.
These data were combined with previously measured photon scattering differential
cross sections and total photoabsorption cross sections to determine the isovector E2
strength and to measure the electric polarizability (a) and magnetic polarizability
({l) of a nucleon bound in 160.
We find that there are no significant compact E2 resonances within the energy
range of this experiment, although the data suggest that an E2 strength greater than
0.5 total energy-weighted sums exists above 64 MeV. The data also suggest that the
magnetic polarizability of a nucleon bound in 160 is greater than that of a free nucleon
and the electric polarizability is smaller. An ambiguity between the E2 strength and
(a - {l) prevents further conclusions based on the present data.
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